A minimal fully asynchronous C# ASP.NET Core 3.x application with routing

README.md

• Copy + paste Program.cs and WebApp.csproj into a directory
• dotnet restore
• dotnet run

App.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
  </PropertyGroup>
</Project>

Program.cs

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace WebApp 
{
  public class Program
  {
    public static async Task<int> Main(string[] args) {
      try {
        var host = new WebHostBuilder()
          .UseKestrel()
          .UseUrls("http://localhost:5000/;https://localhost:5001")
          .ConfigureServices(_configureServices)
          .Configure(_configure)
          .Build();

        await host.RunAsync();

        return 0;
      }
      catch {
        return -1;
      }
    }

    static Action<IServiceCollection> _configureServices = (services) => {
      services.AddRouting();
    };

    static Action<IApplicationBuilder> _configure = app => {
      app.UseRouting();
      app.UseEndpoints(r => {
	r.MapGet("/hello/{name}", ctx => ctx.Response.WriteAsync("hello " + ctx.Request.RouteValues["name"]));
        r.MapGet("/", ctx => ctx.Response.WriteAsync("Hello World!"));
      });
      app.Run((ctx) => ctx.Response.WriteAsync("Page not found."));
    };
  }
}

This is using the old routing system. Endpoint routing is the new one linked in the original gist. It's much faster 😄

This is using the old routing system. Endpoint routing is the new one linked in the original gist. It's much faster 😄

I preferred the API of the IRouter because it more explicitly exposed the parsed route data. But no brainer if the new Endpoint router is that much faster. Updated.

The route data is on the http request